Why agents care about GTINs
Shopping assistants want to match the same physical product across channels. When a GTIN is present and consistent, alignment with Merchant Center, marketplaces, and comparison surfaces is straightforward. When it is absent, the model either omits your item or attaches the wrong variant.
Premium and fashion catalogs often ship without barcodes at import; fixing that gap is one of the highest-leverage local signals you can add without rewriting your entire storefront.
Practical takeaway
Resolve identifiers deliberately: validate against trusted sources before you write to a live variant. Once the data is clean, keep it stable — noisy edits erode trust in downstream feeds and agent memory of your catalog.